Finding the Third Proportional to 12,690 and 18,274.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,690 : 18,274.50 = 18,274.50 : x
2. Step 2: Convert to fraction form
   12,690/18,274.50 = 18,274.50/x
3. Step 3: Cross multiply
   12,690x = 18,274.50 × 18,274.50
4. Step 4: Simplify right side
   12,690x = 333,957,350.25
5. Step 5: Solve for x
   x = 333,957,350.25/12,690
6. Step 6: Final answer
   x = 26,316.58